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specific conductivity, and specific gravity; <br />then <br />• Monthly thereafter for TDS, pH, specific <br />conductivity, and specific gravity; <br />• Quarterly thereafter for the parameters on <br />the short list, Table 2 of the Water <br />Monitoring Plan (Appendix H); <br />• Quarterly for dissolved organic carbon, <br />BETX, and methane in the production fluid <br />only; and <br />• Whenever there is a change in the source of <br />injection fluids. A comprehensive water <br />analysis shall be submitted to the Director <br />within thirty (30) days of any change in <br />injection fluids. <br />(b) For injection activities: Continuous monitoring <br />with 10 minute recording of fluid temperature, <br />flow rate, injection pressure, and cumulative <br />volume. Maximum and minimum values for all <br />parameters shall be recorded on a daily basis. <br />(c) Continuous monitoring with 10 minute recording of <br />the tubing/casing annulus pressure, and <br />determinations of depth to the fluid/mining <br />solution interface within the production <br />tubing/casing annulus. <br />(d) Monitor the fluid added or removed in the <br />casing/tubing annulus, and record the cumulative <br />volume on a daily basis. Sample the injection <br />and production fluid daily for laboratory <br />determination of density. <br />(e) For production activities: Continuous monitoring <br />with 10 minute recording of fluid temperature, <br />flow rate, recovery pressure, and cumulative <br />volume. Maximum and minimum values for each <br />parameter shall be recorded daily. <br />(f) Calculate the mass balance of material injected <br />and removed from an operating solution mining <br />cavity on a monthly basis. After two quarters of <br />data have been collected a modification of the <br />monthly frequency may be made to increase or <br />Page 16 of 120 <br />EPA FINAL Area Permit No. CO3870-00000 <br />